Hey everyone,
I’ve been seeing a bit of weird behaviour and was wondering if this is somehow intentional and I’m missing something or if it is indeed a bug.
I have an application using Playwright (and end-to-end testing framework that basically remote-controls a bunch of browsers) from this PR. The thing is Playwright needs precompiled binarys – mainly Chrome and Firefox – to work. Normally it would download them on the fly, but their location can be passed in using an environment variable. My flake currently looks something like this:
{
packages = rec {
playwright-browsers = runCommand "playwright-browsers" {
outputHashMode = "recursive";
outputHashAlgo = "sha256";
outputHash = {
x86_64-linux = "sha256-OT0YjNBDAb7x4Y1Vh3SlrCZRg4UaD6U2910pSMDbD9Y=";
x86_64-darwin = "sha256-D68dImCeVI4CiRC07kbahZvzFI3y2dShXPal0IH/UHo=";
}.${stdenv.hostPlatform.system} or (throw "Unsupported system");
nativeBuildInputs = lib.optional stdenv.isLinux pkgs.autoPatchelfHook;
} ''
export PLAYWRIGHT_BROWSERS_PATH=$out
${python.pkgs.playwright}/bin/playwright install
rm -r $out/.links
${lib.optionalString stdenv.isLinux ''
autoPatchelf $out --ignore-missing="*"
''}
'';
myapp-base = ...;
myapp = writeShellScriptBin "myapp" ''
export PLAYWRIGHT_BROWSERS_PATH=${playwright-browsers}
exec ${myapp-base}/bin/myapp "$@"
'';
}
}
Now here comes the part I don’t fully understand yet. When I run nix build .#myapp I get a the wrapped myapp script as expected, which does work. The only problem is that Nix doesn’t actually see playwright-browsers as a dependency of myapp. When I copy the latter’s closure to another system, the browser bundle doesn’t get copied and it doesn’t work:
# nix why-depends .#myapp .#playwright-browsers
warning: Git tree '/myapp' is dirty
warning: Git tree '/myapp' is dirty
this derivation will be built:
/nix/store/x1pp4hhlhy2js8wrhfj9q3a5q8snnv73-playwright-browsers.drv
'/nix/store/alr90n1w24brrwifzckraqka42acrlmp-myapp' does not depend on '/nix/store/mkssfmx9vy7izyxy6ylqys9lnblbymaq-playwright-browsers'
The last output was run inside the nixos/nix container from Docker hub (but I’ve also verified this behavior on a NixOS machine). What’s weird to me is that on my Darwin machine, it works:
# nix why-depends .#myapp .#playwright-browsers
/nix/store/5is7r0dwsf71adgsflcx8w6zsqkb0rhk-myapp
└───/nix/store/ffh5fm97cdx7jsjkk0z5679vr4c24cg9-playwright-browsers
I’ve tried debugging with nix build -vvvv .#myapp (inside the container) and here is what I got:
building '/nix/store/x1pp4hhlhy2js8wrhfj9q3a5q8snnv73-playwright-browsers.drv'...
building of '/nix/store/x1pp4hhlhy2js8wrhfj9q3a5q8snnv73-playwright-browsers.drv!out' from .drv file: got EOF
building of '/nix/store/x1pp4hhlhy2js8wrhfj9q3a5q8snnv73-playwright-browsers.drv!out' from .drv file: woken up
building of '/nix/store/x1pp4hhlhy2js8wrhfj9q3a5q8snnv73-playwright-browsers.drv!out' from .drv file: build done
killing process 3168
builder process for '/nix/store/x1pp4hhlhy2js8wrhfj9q3a5q8snnv73-playwright-browsers.drv' finished
killing all processes running under uid '30001'
scanning for references for output 'out' in temp location '/nix/store/mkssfmx9vy7izyxy6ylqys9lnblbymaq-playwright-browsers'
found reference to 'qm2lv1gpbyn0rsfai40cbvj3h4gz69yc' at offset '13'
warning: dumping very large path (> 256 MiB); this may run out of memory
locking path '/nix/store/g2clr8qscq2ax8vl15f0di8d5arxsq0g-playwright-browsers'
lock acquired on '/nix/store/g2clr8qscq2ax8vl15f0di8d5arxsq0g-playwright-browsers.lock'
unreferenced input: '/nix/store/07qa4yv2whpvkq38wwsx8q9mind7mjny-openexr-2.5.7'
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unreferenced input: '/nix/store/6lvkrygz8fbkkwncw8wgb5ads75qv5hi-python3.10-playwright-1.22.0'
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unreferenced input: '/nix/store/6y1pqgrcjq4h5c6n57hn55l04dfcf8qq-nettle-3.7.3'
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unreferenced input: '/nix/store/ba8511amd3kp64mqslxh52db6wxz126a-libssh2-1.10.0'
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unreferenced input: '/nix/store/xc4ci9nqrznz40cvxyjxsyjmv82fnrr2-playwright-driver'
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lock released on '/nix/store/g2clr8qscq2ax8vl15f0di8d5arxsq0g-playwright-browsers.lock'
lock released on '/nix/store/mkssfmx9vy7izyxy6ylqys9lnblbymaq-playwright-browsers.lock'
Notice the package first gets built in the temporary location /nix/store/mkssfmx9vy7izyxy6ylqys9lnblbymaq-playwright-browsers and then gets moved to /nix/store/g2clr8qscq2ax8vl15f0di8d5arxsq0g-playwright-browsers. The latter is also the one I get when running nix build .#playwright-browsers. As far as I understand, this is because it’s a fixed-output derivation and this is to support self-referencing closures (please correct me if I’m wrong here). The problem is that the final output is still referring to the temporary path instead of the final output:
#!/nix/store/qm2lv1gpbyn0rsfai40cbvj3h4gz69yc-bash-5.1-p16/bin/bash
export PLAYWRIGHT_BROWSERS_PATH=/nix/store/mkssfmx9vy7izyxy6ylqys9lnblbymaq-playwright-browsers
exec /nix/store/x5j5mh1hbh8yf8nl5r6gqcdvp4qjckxh-myapp-0.0.1/bin/myapp "$@"
Judging by the further logs, it seems that Nix’s dependency tracking searches for g2clr8qscq2ax8vl15f0di8d5arxsq0g in the final closure, doesn’t find it and then concludes that myapp doesn’t depend on playwright-browsers.
I guess my question here is the following: why does ${playwright-browsers} evaluate to the temporary store path and not the final output path? And why does the behaviour differ under Linux and Darwin? Also, I don’t really understand why this happens (again, under Linux):
# nix path-info --derivation /nix/store/mkssfmx9vy7izyxy6ylqys9lnblbymaq-playwright-browsers
/nix/store/x1pp4hhlhy2js8wrhfj9q3a5q8snnv73-playwright-browsers.drv
# nix path-info --derivation /nix/store/g2clr8qscq2ax8vl15f0di8d5arxsq0g-playwright-browsers
error: '/nix/store/g2clr8qscq2ax8vl15f0di8d5arxsq0g-playwright-browsers' does not have a known deriver
Why doesn’t the final output have a deriver?
I’d greatly appretiate it if anyone had any insights on how to continue debugging this. Thanks!